US11543148B2 - Air conditioning system and control method therof - Google Patents

Air conditioning system and control method therof Download PDF

Info

Publication number
US11543148B2
US11543148B2 US16/842,255 US202016842255A US11543148B2 US 11543148 B2 US11543148 B2 US 11543148B2 US 202016842255 A US202016842255 A US 202016842255A US 11543148 B2 US11543148 B2 US 11543148B2
Authority
US
United States
Prior art keywords
outdoor units
units
actively operating
indoor units
air conditioning
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active, expires
Application number
US16/842,255
Other versions
US20200318849A1 (en
Inventor
Xiaohong Wang
Hui Zhai
Jian Ni
Qing Lu
Liang Chang
Guangyu SHEN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carrier Corp
RTX Corp
Original Assignee
Carrier Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carrier Corp filed Critical Carrier Corp
Assigned to UNITED TECHNOLOGIES RESEARCH CENTRE IRELAND, LIMITED reassignment UNITED TECHNOLOGIES RESEARCH CENTRE IRELAND, LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHANG, Liang, SHEN, Guangyu, LU, QING, NI, JIAN, ZHAI, Hui, WANG, XIAOHONG
Publication of US20200318849A1 publication Critical patent/US20200318849A1/en
Assigned to CARRIER CORPORATION reassignment CARRIER CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RAYTHEON TECHNOLOGIES CORPORATION
Assigned to RAYTHEON TECHNOLOGIES CORPORATION reassignment RAYTHEON TECHNOLOGIES CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: UNITED TECHNOLOGIES RESEARCH CENTER (CHINA) LTD.
Application granted granted Critical
Publication of US11543148B2 publication Critical patent/US11543148B2/en
Active legal-status Critical Current
Adjusted expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/26—Refrigerant piping
    • F24F1/28—Refrigerant piping for connecting several separate outdoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/26—Refrigerant piping
    • F24F1/32—Refrigerant piping for connecting the separate outdoor units to indoor units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/10—Pressure
    • F24F2140/12—Heat-exchange fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the present disclosure relates to the field of air conditioning, and in particular to an air conditioning system and a control method thereof.
  • a coolant (e.g., water) circulation circuit is usually disposed between indoor units and outdoor units to transfer cold or heat.
  • a refrigerant circuit is also usually disposed in each outdoor units, and the refrigerant therein exchanges heat with the coolant circulation circuit through a heat exchanger (for example, a welded plate heat exchanger) in the refrigerant circuit.
  • a threshold value should be set for the flow rate of the coolant in the coolant circulation circuit flowing through each outdoor units. When the flow rate is below the threshold value, an alarm is triggered.
  • an air conditioning system and a control method thereof are provided by the present disclosure, thereby effectively solving or at least alleviating one or more of the above problems in the prior art and in other aspects.
  • an air conditioning system which includes: a plurality of indoor units connected in parallel; a plurality of outdoor units connected in parallel; and a coolant circulation circuit which circulates coolant through each of the indoor units connected in parallel and each of the outdoor units connected in parallel respectively, and which exchanges heat with each of the indoor units and each of the outdoor units; wherein the air conditioning system further includes a controller which, based on a number of actively operating indoor units, a total number of the indoor units and a total number of the outdoor units, defines an upper limit of a number of actively operating outdoor units, so that the flow rate of the coolant flowing through the actively operating outdoor units is not lower than a preset flow rate.
  • the N limit is determined to be 1; and when the obtained N limit >1, the N limit is rounded down.
  • K 2.5.
  • the preset flow rate is not lower than 70% of a rated flow rate of the outdoor units.
  • the air conditioning system further includes a temperature sensor disposed downstream of the indoor units in the coolant circulation circuit to sense a temperature of returned water; wherein the controller is further configured to, when the temperature of returned water is higher than a preset temperature, increase the number of actively operating outdoor units within the upper limit of the number of actively operating outdoor units, and/or increase the operating frequency of the actively operating outdoor units.
  • a control method of an air conditioning system is further provided according to another aspect of the present disclosure, wherein the air conditioning system includes: a plurality of indoor units connected in parallel; a plurality of outdoor units connected in parallel; a coolant circulation circuit which circulates coolant through each of the indoor units connected in parallel and each of the outdoor units connected in parallel respectively, and which exchanges heat with each of the indoor units and each of the outdoor units; and a controller; the control method includes: based on a number of actively operating indoor units, a total number of the indoor units and a total number of the outdoor units, defining an upper limit of actively operating outdoor units, so that the flow rate of the coolant flowing through the actively operating outdoor units is not lower than a preset flow rate.
  • the N limit is determined to be 1; and when the obtained N limit >1, the N limit is rounded down.
  • K 2.5.
  • the preset flow rate is not lower than 70% of a rated flow rate of the outdoor units.
  • a temperature of returned water after the coolant in the coolant circulation circuit flows out of the indoor units is obtained;
  • the temperature of returned water is higher than a preset temperature, the number of actively operating outdoor units is increased within the upper limit of the number of actively operating outdoor units, and/or the operating frequency of the actively operating outdoor units is increased.
  • the system by associating the operating state of the indoor units with the adjustment of the outdoor units, the system is capable of defining an upper limit of the number of actively operating outdoor units based on a number of actively operating indoor units, a total number of the indoor units and a total number of the outdoor units, so that the flow rate of the coolant flowing through the actively operating outdoor units is not lower than a preset flow rate. In this way, it is ensured that the outdoor units will not be frozen due to overly low flow rate even if the indoor units have a low load, and triggering of freezing alarm is also avoided.
  • FIG. 1 is a schematic diagram of an embodiment of an air conditioning system of the present disclosure.
  • the air conditioning system proposed by the present disclosure does not narrowly refer to an air conditioner for use in a building having an outdoor cooling/heating unit and an indoor heat exchange unit in the industry. It should be construed as a kind of thermal system with air conditioning function, which is driven by various types of power sources (for example, electric power) to transfer the heat generated by phase change of the refrigerant in the system to a position to be adjusted via the coolant, and to exchange heat with the air there.
  • power sources for example, electric power
  • the air conditioning system 100 includes a plurality of indoor units 111 , 112 , a plurality of outdoor units 121 , 122 , and a coolant circulation circuit 130 .
  • the coolant circulation circuit 130 has branches connected in parallel with each other which lead to individual indoor units 111 , 112 so that each branch exchanges heat with the corresponding indoor units 111 , 112 or is separately controlled.
  • the coolant circulation circuit 130 also has branches connected in parallel with each other which lead to the corresponding outdoor units 121 , 122 so that each branch exchanges heat with the corresponding outdoor units 121 , 122 or is separately controlled.
  • each of the outdoor units 121 , 122 typically includes an independent refrigeration circuit such that the compressed refrigerant in the refrigeration circuit transfers cold or heat between the outdoor environment and the coolant in the coolant circuit 130 .
  • the coolant circuit transfers the cold or heat from the outdoor units 121 , 122 to the actively operating indoor units 111 , 112 via the coolant.
  • the number is the upper limit of the number of operable outdoor units 121 and 122 .
  • the flow rate of the coolant flowing through the outdoor units 121 and 122 will be higher than the preset flow rate, which avoids the freezing problem and improves system reliability.
  • the upper limit of the number is also associated with the set coefficient K, which is an operating margin provided by the work staff.
  • K>1 can be set, for the purpose of improving reliability as much as possible, and K ⁇ 1 can be set, for the purpose of energy saving.
  • N limit the upper limit of the number of actively operating outdoor units 121 and 122
  • the number of operable outdoors units in actual operation is necessarily an integer.
  • N limit the number of operable outdoors units in actual operation is necessarily an integer.
  • N limit the N limit can be determined to be 1.
  • a bypass branch 132 may be added in the circuit to provide a certain degree of bypass flow to meet the minimum flow requirements of the outdoor units 121 , 122 .
  • a coolant having a sufficient flow rate flows through the outdoor units 121 , 122 to prevent it from freezing; and on the other hand, the cooling capacity or heating capacity required by the indoor units 111 , 112 is limited, and accordingly the flow rate of the coolant required to flow therethrough is also limited.
  • the bypass branch 132 is opened to bypass this part of coolant, so that the low load demand of the indoor units and the anti-freezing demand of the outdoor units are both met.
  • a temperature sensor may also be provided within the system.
  • the temperature sensor is disposed downstream of the indoor units 111 , 112 in the coolant circulation circuit 130 to sense the temperature of returned water.
  • the controller 140 is further configured to, when the temperature of returned water is higher than a preset temperature, increase the number of actively operating outdoor units 121 , 122 within the upper limit of the number of actively operating outdoor units 121 , 122 , and/or increase the operating frequency of the actively operating outdoor units 121 , 122 .
  • a control method of an air conditioning system is also provided herein.
  • the control method can be applied to the air conditioning system described in any of the foregoing embodiments or combinations thereof. Alternatively, it can be applied to other air conditioning systems as well.
  • the air conditioning system to which the control method is applied should include: a plurality of indoor units connected in parallel; a plurality of outdoor units connected in parallel; and a coolant circulation circuit.
  • the coolant circulation circuit circulates coolant through each of the indoor units connected in parallel and each of the outdoor units connected in parallel respectively, and exchanges heat with each of the indoor units and each of the outdoor units.
  • the air conditioning system should further include a controller.
  • the number of actively operating outdoor units should be reduced.
  • the number is the upper limit of the number of operable outdoor units.
  • the flow rate of the coolant flowing through the outdoor units will be higher than the preset flow rate, which avoids the freezing problem and improves system reliability.
  • the upper limit of the number is also associated with the set coefficient K, which is an operating margin provided by the work staff.
  • the preset flow rate mentioned in the foregoing embodiment may be associated with various design parameters of the outdoor units, and the preset flow rate may be adjusted according to the degree to which the freezing problem at a lower flow rate can be tolerated. For example, in a more reliable solution, the preset flow rate can be set to be no less than 70% of the rated flow rate of the outdoor units.
  • a bypass branch may be added in the circuit to provide a certain degree of bypass flow to meet the minimum flow requirements of the outdoor units.
  • the output capacity of the outdoor units can be adjusted according to the temperature of returned water, so that the cooling capacity or the heating capacity required by the indoor units can be met; and on the other hand, each of the above adjustments is within the upper limit of the number of actively operating outdoor units, whereby it is ensured that the adjustment process does not affect the minimum output flow rate of the outdoor units, thereby avoiding triggering an alarm or occurrence of freezing phenomenon; and improving system reliability.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Thermal Sciences (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

An air conditioning system and a control method thereof. The air conditioning system includes: a plurality of indoor units connected in parallel; a plurality of outdoor units connected in parallel; and a coolant circulation circuit which circulates coolant through each of the indoor units connected in parallel and each of the outdoor units connected in parallel respectively, and which exchanges heat with each of the indoor units and each of the outdoor units; wherein the air conditioning system further includes a controller which, based on a number of actively operating indoor units, a total number of the indoor units and a total number of the outdoor units, defines an upper limit of a number of actively operating outdoor units, so that the flow rate of the coolant flowing through the actively operating outdoor units is not lower than a preset flow rate.

Description

FOREIGN PRIORITY
This application claims priority to Chinese Patent Application No. 201910275837.X, filed Apr. 8, 2019, and all the benefits accruing therefrom under 35 U.S.C. § 119, the contents of which in its entirety are herein incorporated by reference.
FIELD OF THE INVENTION
The present disclosure relates to the field of air conditioning, and in particular to an air conditioning system and a control method thereof.
BACKGROUND OF THE INVENTION
Currently, in large-scale scenarios with refrigeration requirements in commercial applications, a coolant (e.g., water) circulation circuit is usually disposed between indoor units and outdoor units to transfer cold or heat. A refrigerant circuit is also usually disposed in each outdoor units, and the refrigerant therein exchanges heat with the coolant circulation circuit through a heat exchanger (for example, a welded plate heat exchanger) in the refrigerant circuit. In this case, in order to prevent the heat exchanger from freezing due to insufficient heat absorption, a threshold value should be set for the flow rate of the coolant in the coolant circulation circuit flowing through each outdoor units. When the flow rate is below the threshold value, an alarm is triggered. However, in practical applications, for example, when a total load of the indoor units is low due to the small number of operating indoor units, if a large load is still maintained on the outdoor unit and the adjustment capability of a bypass flow path is insufficient, the aforementioned alarm will also be triggered. Because such phenomena are common, alarm will be triggered frequently, or even the system will be shut down, which greatly affects the reliability of system operation and user experience.
SUMMARY OF THE INVENTION
In view of this, an air conditioning system and a control method thereof are provided by the present disclosure, thereby effectively solving or at least alleviating one or more of the above problems in the prior art and in other aspects.
In order to achieve at least one object of the present disclosure, an air conditioning system is provided according to an aspect of the present disclosure, which includes: a plurality of indoor units connected in parallel; a plurality of outdoor units connected in parallel; and a coolant circulation circuit which circulates coolant through each of the indoor units connected in parallel and each of the outdoor units connected in parallel respectively, and which exchanges heat with each of the indoor units and each of the outdoor units; wherein the air conditioning system further includes a controller which, based on a number of actively operating indoor units, a total number of the indoor units and a total number of the outdoor units, defines an upper limit of a number of actively operating outdoor units, so that the flow rate of the coolant flowing through the actively operating outdoor units is not lower than a preset flow rate.
Optionally, the upper limit of the number of the actively operating outdoor units is Nlimit=K*(Mrunning/Mttotal)*total; where K is a set coefficient, Mrunning is the number of actively operating indoor units, Mtotal is the total number of the indoor units, and Ntotal is the total number of the outdoor units.
Optionally, when the obtained Nlimit≤1, the Nlimit is determined to be 1; and when the obtained Nlimit>1, the Nlimit is rounded down.
Optionally, K≤1 or K>1.
Optionally, K=2.5.
Optionally, the preset flow rate is not lower than 70% of a rated flow rate of the outdoor units.
Optionally, the air conditioning system further includes a temperature sensor disposed downstream of the indoor units in the coolant circulation circuit to sense a temperature of returned water; wherein the controller is further configured to, when the temperature of returned water is higher than a preset temperature, increase the number of actively operating outdoor units within the upper limit of the number of actively operating outdoor units, and/or increase the operating frequency of the actively operating outdoor units.
In order to achieve at least one object of the present disclosure, a control method of an air conditioning system is further provided according to another aspect of the present disclosure, wherein the air conditioning system includes: a plurality of indoor units connected in parallel; a plurality of outdoor units connected in parallel; a coolant circulation circuit which circulates coolant through each of the indoor units connected in parallel and each of the outdoor units connected in parallel respectively, and which exchanges heat with each of the indoor units and each of the outdoor units; and a controller; the control method includes: based on a number of actively operating indoor units, a total number of the indoor units and a total number of the outdoor units, defining an upper limit of actively operating outdoor units, so that the flow rate of the coolant flowing through the actively operating outdoor units is not lower than a preset flow rate.
Optionally, the upper limit of the number of the actively operating outdoor units is Nlimit=K*(Mrunning/Mtotal)*Ntotal; where K is a set coefficient, Mrunning is the activation number of actively operating indoor units, Mtotal is the total number of the indoor units, and Ntotal is the total number of the outdoor units.
Optionally, when the obtained Nlimit≤1, the Nlimit is determined to be 1; and when the obtained Nlimit>1, the Nlimit is rounded down.
Optionally, K≤1 or K>1.
Optionally, K=2.5.
Optionally, the preset flow rate is not lower than 70% of a rated flow rate of the outdoor units.
Optionally, a temperature of returned water after the coolant in the coolant circulation circuit flows out of the indoor units is obtained; When the temperature of returned water is higher than a preset temperature, the number of actively operating outdoor units is increased within the upper limit of the number of actively operating outdoor units, and/or the operating frequency of the actively operating outdoor units is increased.
According to the air conditioning system and the control method thereof a the present disclosure, by associating the operating state of the indoor units with the adjustment of the outdoor units, the system is capable of defining an upper limit of the number of actively operating outdoor units based on a number of actively operating indoor units, a total number of the indoor units and a total number of the outdoor units, so that the flow rate of the coolant flowing through the actively operating outdoor units is not lower than a preset flow rate. In this way, it is ensured that the outdoor units will not be frozen due to overly low flow rate even if the indoor units have a low load, and triggering of freezing alarm is also avoided.
BRIEF DESCRIPTION OF THE DRAWINGS
The technical solutions of the present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments, but it should be understood that the drawings are only provided for the purpose of explanation, and should not be considered as limiting the scope of the present disclosure. In addition, unless otherwise specified, the drawings are only intended to conceptually illustrate the structures and constructions described herein, and are not necessarily drawn to scale.
FIG. 1 is a schematic diagram of an embodiment of an air conditioning system of the present disclosure.
 DETAILED DESCRIPTION OF THE EMBODIMENT(S) OF THE INVENTION
The present disclosure will be described more fully with reference to the accompanying drawings in which exemplary embodiments of the present disclosure are illustrated. However, it should be understood that the present disclosure may be embodied in a variety of different forms and should not be construed as being limited to the embodiments set forth herein. Herein, the embodiments are provided to make the present disclosure more complete and thorough, and to fully convey the concept of the present disclosure to those skilled in the art.
It should also be understood by those skilled in the art that the air conditioning system proposed by the present disclosure does not narrowly refer to an air conditioner for use in a building having an outdoor cooling/heating unit and an indoor heat exchange unit in the industry. It should be construed as a kind of thermal system with air conditioning function, which is driven by various types of power sources (for example, electric power) to transfer the heat generated by phase change of the refrigerant in the system to a position to be adjusted via the coolant, and to exchange heat with the air there.
Referring to FIG. 1 , an embodiment of an air conditioning system 100 is illustrated. The air conditioning system 100 includes a plurality of indoor units 111, 112, a plurality of outdoor units 121, 122, and a coolant circulation circuit 130. The coolant circulation circuit 130 has branches connected in parallel with each other which lead to individual indoor units 111, 112 so that each branch exchanges heat with the corresponding indoor units 111, 112 or is separately controlled. Similarly, the coolant circulation circuit 130 also has branches connected in parallel with each other which lead to the corresponding outdoor units 121, 122 so that each branch exchanges heat with the corresponding outdoor units 121, 122 or is separately controlled. In such an arrangement, each of the outdoor units 121, 122 typically includes an independent refrigeration circuit such that the compressed refrigerant in the refrigeration circuit transfers cold or heat between the outdoor environment and the coolant in the coolant circuit 130. The coolant circuit transfers the cold or heat from the outdoor units 121, 122 to the actively operating indoor units 111, 112 via the coolant. In this case, the indoor units 111 and 112 may have only a fan and an air outlet structure, thereby directly driving the air and the coolant circulation circuit 130 passing through the indoor units 111 and 112 to exchange heat via convection to realize the air conditioning function; alternatively, the indoor units 111, 112 may also have another refrigeration circuit, that is, the air conditioning function is realized by heat exchange between the coolant in the coolant circulation circuit 130 and the application environment via the refrigerant in the refrigeration circuit again. Generally, in order to achieve control of the flow of the coolant in the coolant circulation circuit 130, a hydraulic module 131 is also provided, which typically includes a drive pump and a regulating valve to respectively realize the functions of power supplying and flow control.
In addition, the air conditioning system 100 further includes a controller 140 which, based on a number of actively operating indoor units 111, 112, a total number of the indoor units 111, 112 and a total number of the outdoor units 121, 122, defines an upper limit of a number of actively operating outdoor units 121, 122, so that the flow rate of the coolant flowing through the actively operating outdoor units 121, 122 is not lower than a preset flow rate. In this case, by associating the operating state of the indoor units 111, 112 with the adjustment of the outdoor units 121, 122, it is ensured that the outdoor units 121, 122 will not be frozen due to overly low flow rate even if the indoor units 111, 112 have a low load, and triggering of freezing alarm is also avoided.
In order to achieve the above control, as a specific manner of determining, the upper limit of the number of actively operating outdoor units 121, 122 may be Nlimit=K*(MrunningMtotal)*Ntotal; where K is a set coefficient, Mrunning is the number of actively operating indoor units 111, 112, Mtotal is the total number of the indoor units 111, 112, and Ntotal is the total number the outdoor units 121, 122. In this of case, if the number of actively operating indoor units 111, 112 has a reduced percentage in the total number of the indoor units 111, 112, it means that the flow rate of the coolant in the coolant circulation circuit 130 that is required to participate in work is also reduced accordingly; that is, the flow rate of the coolant flowing through each of the outdoor units 121, 122 is also reduced. In this situation, in order to prevent the components in the outdoor units 121 and 122 from being frozen due to the flow rate of the coolant flowing through the outdoor units 121 and 122 being lower than a preset flow rate, the number of actively operating outdoor units 121 and 122 should be reduced. According to the above manner of determining, the number is the upper limit of the number of operable outdoor units 121 and 122. When the number of actively operating outdoor units 121 and 122 is not less than the upper limit, the flow rate of the coolant flowing through the outdoor units 121 and 122 will be higher than the preset flow rate, which avoids the freezing problem and improves system reliability. Also, as can be known from the above manner of determining, the upper limit of the number is also associated with the set coefficient K, which is an operating margin provided by the work staff. For example, K>1 can be set, for the purpose of improving reliability as much as possible, and K≤1 can be set, for the purpose of energy saving. In any case, it should be ensured that the setting of K does not cause the following situation within the upper limit Nlimit of the number of actively operating outdoor units 121, 122; the flow rate of the coolant flowing through the outdoor units 121, 122 being lower than the preset flow rate. Therefore, K>1 is typically set. In a more reliable solution, K=2.5 is set.
Similarly, the preset flow rate mentioned in the foregoing embodiment may be associated with various design parameters of the outdoor units 121, 122, and the preset flow rate may be adjusted according to the degree to which the freezing problem at a lower flow rate can be tolerated. For example, in a more reliable solution, the preset flow rate can be set to be no less than 70% of the rated flow rate of the outdoor units 121, 122.
In addition, when the above manner of determining is used in actual applications to obtain the upper limit Nlimit of the number of actively operating outdoor units 121 and 122, there may be a case where the upper limit of the number of actively operating outdoor units 121 and 122 is not an integer. However, the number of operable outdoors units in actual operation is necessarily an integer. In this case, when the obtained upper limit of the number actively operating outdoor units, Nlimit≤1, in order to ensure that the system can work normally, Nlimit can be determined to be 1. When the obtained Nlimit>1, the Nlimit may be rounded down to ensure that the flow requirements of the actively operating outdoor units 121 and 122 are met. For example, when Nlimit=5.4, the upper limit of the number of actively operating outdoor units 121 and 122 is 5.
Furthermore, if it is desired to further improve the adjustment capability of the coolant circulation circuit 130 of the system, a bypass branch 132 may be added in the circuit to provide a certain degree of bypass flow to meet the minimum flow requirements of the outdoor units 121, 122. Specifically, on one hand, it is necessary to ensure that a coolant having a sufficient flow rate flows through the outdoor units 121, 122 to prevent it from freezing; and on the other hand, the cooling capacity or heating capacity required by the indoor units 111, 112 is limited, and accordingly the flow rate of the coolant required to flow therethrough is also limited. In this case, if a difference between the coolant flow rate required by the outdoor units and the coolant flow rate required by the indoor units is within an adjustable range of the bypass branch 132, the bypass branch 132 is opened to bypass this part of coolant, so that the low load demand of the indoor units and the anti-freezing demand of the outdoor units are both met.
Optionally, a temperature sensor may also be provided within the system. The temperature sensor is disposed downstream of the indoor units 111, 112 in the coolant circulation circuit 130 to sense the temperature of returned water. In this case, the controller 140 is further configured to, when the temperature of returned water is higher than a preset temperature, increase the number of actively operating outdoor units 121, 122 within the upper limit of the number of actively operating outdoor units 121, 122, and/or increase the operating frequency of the actively operating outdoor units 121, 122. At this point, on one hand, the output capacity of the outdoor units 121, 122 can be adjusted according to the temperature of returned water, so that the cooling capacity or the heating capacity required by the indoor units 111, 112 can be met; and on the other hand, each of the above adjustments is within the upper limit of the number of actively operating outdoor units 121, 122, whereby it is ensured that the adjustment process does not affect the minimum output flow rate of the outdoor units 121, 122, thereby avoiding triggering an alarm or occurrence of freezing phenomenon, and improving system reliability.
Further, although not shown in the drawings, a control method of an air conditioning system is also provided herein. The control method can be applied to the air conditioning system described in any of the foregoing embodiments or combinations thereof. Alternatively, it can be applied to other air conditioning systems as well. In this case, the air conditioning system to which the control method is applied should include: a plurality of indoor units connected in parallel; a plurality of outdoor units connected in parallel; and a coolant circulation circuit. The coolant circulation circuit circulates coolant through each of the indoor units connected in parallel and each of the outdoor units connected in parallel respectively, and exchanges heat with each of the indoor units and each of the outdoor units. In addition, the air conditioning system should further include a controller. In the application process, the control method includes: based on number of actively operating indoor units, a total number of the indoor units and a total number of the outdoor units, defining an upper limit of an number of actively operating outdoor units, so that the flow rate of the coolant flowing through the actively operating outdoor units is not lower than a preset flow rate. Under the control of the control method, by associating the operating state of the indoor units with the adjustment of the outdoor units, it is ensured that the outdoor units will not be frozen due to overly low flow rate even if the indoor units have a low load, and triggering of freezing alarm is also avoided.
In order to achieve the above control, as a specific manner of determining in the control method, the upper limit of the number of actively operating outdoor units may be Nlimit=K*(Mrunning/Mtotal)*Ntotal; where K is a set coefficient, Mrunning is the number of actively operating indoor units, Mtotal is the total number of the indoor units, and Ntotal is the total number of the outdoor units. In this case, if the number of actively operating indoor units has a reduced percentage in the total number of the indoor units, it means that the flow rate of the coolant in the coolant circulation circuit that is required to participate in work is also reduced accordingly; that is, the flow rate of the coolant flowing through each of the outdoor units is also reduced. In this situation, in order to prevent the components in the outdoor units from being frozen due to the flow rate of the coolant flowing through the outdoor units being lower than a preset flow rate, the number of actively operating outdoor units should be reduced. According to the above manner of determining, the number is the upper limit of the number of operable outdoor units. When the number of actually actively operating outdoor units is not less than the upper limit, the flow rate of the coolant flowing through the outdoor units will be higher than the preset flow rate, which avoids the freezing problem and improves system reliability. Also, as can be known from the above manner of determining, the upper limit of the number is also associated with the set coefficient K, which is an operating margin provided by the work staff. For example, K>1 can be set, for the purpose of improving reliability as much as possible, and K≤1 can be set, for the purpose of energy saving. In any case, it should be ensured that the setting of K does not cause the following situation within the upper limit Nlimit of the number of actively operating outdoor units: the flow rate of the coolant flowing through the outdoor units being lower than the preset flow rate. Therefore, K>1 is typically set. In a more reliable solution, K=2.5 is set.
Similarly, the preset flow rate mentioned in the foregoing embodiment may be associated with various design parameters of the outdoor units, and the preset flow rate may be adjusted according to the degree to which the freezing problem at a lower flow rate can be tolerated. For example, in a more reliable solution, the preset flow rate can be set to be no less than 70% of the rated flow rate of the outdoor units.
In addition, when the above manner of determining is used in actual applications to obtain the upper limit Nlimit of the number of actively operating outdoor units, there may be a case where the upper limit of the number of actively operating outdoor units is not an integer. However, the number of operable outdoor units actively operating is necessarily an integer. In this case, when the obtained upper limit of the number of actively operating outdoor units, Nlimit≤1, in order to ensure that the system can work normally, Nlimit can be determined to be 1. When the obtained Nlimit>1, the Nlimit may be rounded down to ensure that the flow requirements of the actively operating outdoor units are met. For example, when Nlimit=5.4, the upper limit of the number of actively operating outdoor units is 5.
Furthermore, if it is desired to further improve the adjustment capability of the coolant circulation circuit of the system, a bypass branch may be added in the circuit to provide a certain degree of bypass flow to meet the minimum flow requirements of the outdoor units.
Optionally, a temperature sensor may also be provided within the system to sense a temperature of returned water after the coolant in the coolant circulation circuit flows out of the indoor units. In this case, the controller is further configured to adjust the outdoor units based on the temperature of returned water. Specifically, the controller is configured to: When the temperature of returned water is higher than a preset temperature, increase the number of actively operating outdoor units within the upper limit of the number of actively operating outdoor units, and/or increase the operating frequency of the actively operating outdoor units. At this point, on one hand, the output capacity of the outdoor units can be adjusted according to the temperature of returned water, so that the cooling capacity or the heating capacity required by the indoor units can be met; and on the other hand, each of the above adjustments is within the upper limit of the number of actively operating outdoor units, whereby it is ensured that the adjustment process does not affect the minimum output flow rate of the outdoor units, thereby avoiding triggering an alarm or occurrence of freezing phenomenon; and improving system reliability.
In addition, it should be noted that while particular order of steps may have been shown, disclosed, and claimed in the above particular embodiments, it is understood that some steps can be carried out, separated or combined in any order unless it is expressly indicated that they should be executed in the particular order.
The controllers described above for performing the aforementioned method may involve several functional entities that do not necessarily have to correspond to physically or logically independent entities. These functional entities may also be implemented in software, or implemented in one or more hardware modules or integrated circuits, or implemented in different processing devices and/or microcontroller devices.
In the description, examples are used to disclose the present application, including the best mode, with the purpose of enabling any person skilled in the art to practice the application, including making and using any device or system and performing any of the methods covered. The scope of protection of the present application is defined by the claims, and may include other examples that can be conceived by those skilled in the art. If such other examples have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements that do not substantively differ from the literal language of the claims, these examples are also intended to be included in the scope of the claims.

Claims (10)

What is claimed is:
1. An air conditioning system, characterized in comprising:
a plurality of indoor units connected in parallel;
a plurality of outdoor units connected in parallel; and
a coolant circulation circuit which circulates a coolant through each of the indoor units connected in parallel and each of the outdoor units connected in parallel respectively, and which exchanges heat with each of the indoor units and each of the outdoor units;
wherein the air conditioning system further comprises a controller which, based on a number of actively operating indoor units, a total number of the indoor units and a total number of the outdoor units, defines an upper limit of a number of actively operating outdoor units, so that a flow rate of the coolant flowing through actively operating outdoor units is not lower than a preset flow rate.
2. The air conditioning system according to claim 1, wherein the upper limit of the number of actively operating outdoor units is Nlimit=K*(Mrunning/Mtotal)*Ntotal; where K is a predetermined coefficient, Mrunning is the number of actively operating indoor units, Mtotal is the total number of the indoor units, and Ntotal is the total number of the outdoor units.
3. The air conditioning system according to claim 2, wherein when Nlimit≤1, Nlimit is set to 1; and when the obtained Nlimit>1, Nlimit is rounded down to a nearest integer.
4. The air conditioning system according to claim 2, wherein K=2.5.
5. The air conditioning system according to claim 1, further comprising a temperature sensor disposed downstream of the indoor units in the coolant circulation circuit to sense a temperature of returned water; wherein the controller is further configured to, when the temperature of returned water is higher than a preset temperature, increase the number of actively operating outdoor units within the upper limit of the number of actively operating outdoor units, and/or increase the operating frequency of the actively operating outdoor units.
6. A control method of an air conditioning system, wherein the air conditioning system comprises:
a plurality of indoor units connected in parallel;
a plurality of outdoor units connected in parallel;
a coolant circulation circuit which circulates a coolant through each of the indoor units connected in parallel and each of the outdoor units connected in parallel respectively, and which exchanges heat with each of the indoor units and each of the outdoor units; and
a controller;
the control method comprises: based on a number of actively operating indoor units, a total number of the indoor units and a total number of the outdoor units, defining an upper limit of a number of actively operating outdoor units, so that a flow rate of the coolant flowing through actively operating outdoor units is not lower than a preset flow rate.
7. The control method according to claim 6, wherein the upper limit of the number of actively operating outdoor units is Nlimit=K*(Mrunning/Mtotal)*Ntotal; where K is a predetermined set coefficient, Mrunning is the number of actively operating indoor units, Mtotal is the total number of the indoor units, and Ntotal is the total number of the outdoor units.
8. The control method according to claim 7, wherein when Nlimit≤1, Nlimit is set to 1; and when Nlimit>1, Nlimit is rounded down to a nearest integer.
9. The control method according to claim 7, wherein K=2.5.
10. The control method according to claim 6, wherein a temperature of returned water after the coolant in the coolant circulation circuit flows out of the indoor units is obtained; when the temperature of returned water is higher than a preset temperature, the number of actively operating outdoor units is increased within the upper limit of the number of actively operating outdoor units, and/or the operating frequency of the actively operating outdoor units is increased.
US16/842,255 2019-04-08 2020-04-07 Air conditioning system and control method therof Active 2041-01-30 US11543148B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910275837.XA CN111795481B (en) 2019-04-08 2019-04-08 Air conditioning system and control method therefor
CN201910275837.X 2019-04-08

Publications (2)

Publication Number Publication Date
US20200318849A1 US20200318849A1 (en) 2020-10-08
US11543148B2 true US11543148B2 (en) 2023-01-03

Family

ID=72661565

Family Applications (1)

Application Number Title Priority Date Filing Date
US16/842,255 Active 2041-01-30 US11543148B2 (en) 2019-04-08 2020-04-07 Air conditioning system and control method therof

Country Status (2)

Country Link
US (1) US11543148B2 (en)
CN (1) CN111795481B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111486575B (en) * 2020-04-29 2022-03-29 广东美的暖通设备有限公司 Air conditioning system, hydraulic module and condensation prevention control method of hydraulic module
CN111486576B (en) * 2020-04-29 2021-10-08 广东美的暖通设备有限公司 Air conditioning system, hydraulic module and control method of hydraulic module
CN111503817B (en) * 2020-04-29 2021-12-28 广东美的暖通设备有限公司 Air conditioning system, hydraulic module and condensation prevention control method of hydraulic module
CN113483451B (en) * 2021-07-12 2022-06-14 珠海格力电器股份有限公司 Control method and module for air conditioner operation, air conditioner and computer storage medium

Citations (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4817395A (en) 1987-06-11 1989-04-04 Martinez Jr George Method and apparatus for saving energy in an air conditioning system
US6085532A (en) 1999-02-05 2000-07-11 American Standard Inc. Chiller capacity control with variable chilled water flow compensation
US6732540B2 (en) 2002-07-19 2004-05-11 Hitachi Plant Engineering & Construction Co., Ltd. Air conditioning plant and control method thereof
US20090178424A1 (en) * 2007-12-21 2009-07-16 Lg Electronics Inc. Air conditioner
US7600389B2 (en) * 2004-12-14 2009-10-13 Lg Electronics Inc. Multi-unit air conditioner and method for controlling the same
US7658335B2 (en) 2007-01-26 2010-02-09 Thermodynamic Process Control, Llc Hydronic heating system
US7730935B1 (en) 1999-12-27 2010-06-08 Carrier Corporation Hydronic system control for heating and cooling
CN201589376U (en) 2009-12-31 2010-09-22 肖安 Central air-conditioning variable water volume and variable air volume whole group-control energy saving system
CN201589718U (en) 2010-03-02 2010-09-22 中国船舶重工集团公司第七�三研究所 Energy saving cooling unit testing system
CN102288421A (en) 2011-05-03 2011-12-21 合肥通用机械研究院 Variable capacity chiller test device
US8126595B2 (en) 2008-05-13 2012-02-28 Solarlogic, Llc System and method for controlling hydronic systems having multiple sources and multiple loads
US8275483B2 (en) 2009-07-23 2012-09-25 Siemens Industry, Inc. Demand flow pumping
US8285129B2 (en) 2008-06-24 2012-10-09 Kyungdong One Corporation Hot water supply system for constantly maintaining temperature of hot water
CN103383121A (en) 2012-05-03 2013-11-06 南京市建筑设计研究院有限责任公司 District air-conditioner distributed secondary pump system
US20140223941A1 (en) * 2011-09-30 2014-08-14 Daikin Industries, Ltd. Refrigeration system
US8939196B2 (en) * 2009-02-13 2015-01-27 Toshiba Carrier Corporation Secondary pump type heat source and secondary pump type heat source control method
US9003821B2 (en) 2010-02-02 2015-04-14 Exaflop Llc Blended water-based data center cooling
EP2313694B1 (en) 2008-06-27 2016-04-27 Kyungdong One Corporation Method for controlling a hot water temperature in using low flux in hot water supply system
US9410752B2 (en) 2012-08-17 2016-08-09 Albert Reid Wallace Hydronic building systems control
CN105864016A (en) 2016-04-27 2016-08-17 西安建筑科技大学 Variable-water-volume operation regulating method for open multi-water-pump transmission and distribution system
US9519297B1 (en) 2010-08-17 2016-12-13 Vytautas K. Virskus Dynamic differential energy control of hydronic heating or cooling systems
US20170212488A1 (en) 2016-01-22 2017-07-27 Johnson Controls Technology Company Systems and methods for monitoring and controlling a central plant
US20170234559A1 (en) 2014-08-14 2017-08-17 Vigilent Corporation Method and apparatus for optimizing control variables to minimize power consumption of cooling systems
US9810438B2 (en) 2011-08-26 2017-11-07 Optimum Energy Llc Controlled hydronic distribution system
US9845983B2 (en) 2012-04-06 2017-12-19 Zhongxi Tan Central air-conditioning system and control method thereof
WO2018011761A1 (en) 2016-07-15 2018-01-18 Barghest Building Performance Pte. Ltd. Method for improving operational efficiency of a cooling system through retrofitting a building with a master controller
WO2018087810A1 (en) 2016-11-08 2018-05-17 三菱電機株式会社 Heating control system and heat pump hot-water heating system
US20180239371A1 (en) 2017-02-22 2018-08-23 Johnson Controls Technology Company Integrated smart actuator device
EP2775221B1 (en) 2013-03-08 2018-09-05 Pompes Salmson Regulation of the flow and temperature of a sanitary hot water circulator
US20180284701A1 (en) 2017-03-31 2018-10-04 Johnson Controls Technology Company Control system with dimension reduction for multivariable optimization
US10101730B2 (en) 2014-05-01 2018-10-16 Johnson Controls Technology Company Incorporating a load change penalty in central plant optimization
US10215427B2 (en) * 2013-04-01 2019-02-26 Carrier Corporation Air conditioning system and method for controlling air conditioning system

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2975612B2 (en) * 1989-08-17 1999-11-10 株式会社日立製作所 Multi air conditioner
JPH05340627A (en) * 1992-06-09 1993-12-21 Sanyo Electric Co Ltd Air conditioner
JP3394379B2 (en) * 1996-01-18 2003-04-07 松下エコシステムズ株式会社 Heat exchange unit and multi-room air conditioner
JP3732984B2 (en) * 1999-12-14 2006-01-11 三洋電機株式会社 Air conditioner
JP2008232562A (en) * 2007-03-22 2008-10-02 Daikin Ind Ltd Air conditioning system
JP2011196630A (en) * 2010-03-19 2011-10-06 Fujitsu General Ltd Multi-room type air conditioning device
CN104344456B (en) * 2013-07-29 2017-03-29 广东美的暖通设备有限公司 The uneven control method of multi-online air-conditioning system and its off-premises station coolant distribution
JP6716238B2 (en) * 2015-12-02 2020-07-01 東芝キヤリア株式会社 Refrigerating and air-conditioning device, control device, and computer program
CN205372882U (en) * 2016-03-08 2016-07-06 特灵空调系统(中国)有限公司 Adopt air conditioner water system that divides water collector
CN107091498B (en) * 2017-05-11 2020-03-17 广东志高暖通设备股份有限公司 Air conditioner control system and multi-tube set air conditioner
CN210511905U (en) * 2019-07-30 2020-05-12 河南省宇基环保科技有限公司 Energy-saving control system for machine room water pump of shallow geothermal energy thermal power station

Patent Citations (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4817395A (en) 1987-06-11 1989-04-04 Martinez Jr George Method and apparatus for saving energy in an air conditioning system
US6085532A (en) 1999-02-05 2000-07-11 American Standard Inc. Chiller capacity control with variable chilled water flow compensation
US7730935B1 (en) 1999-12-27 2010-06-08 Carrier Corporation Hydronic system control for heating and cooling
US6732540B2 (en) 2002-07-19 2004-05-11 Hitachi Plant Engineering & Construction Co., Ltd. Air conditioning plant and control method thereof
US7600389B2 (en) * 2004-12-14 2009-10-13 Lg Electronics Inc. Multi-unit air conditioner and method for controlling the same
US7658335B2 (en) 2007-01-26 2010-02-09 Thermodynamic Process Control, Llc Hydronic heating system
US20090178424A1 (en) * 2007-12-21 2009-07-16 Lg Electronics Inc. Air conditioner
US8126595B2 (en) 2008-05-13 2012-02-28 Solarlogic, Llc System and method for controlling hydronic systems having multiple sources and multiple loads
US8285129B2 (en) 2008-06-24 2012-10-09 Kyungdong One Corporation Hot water supply system for constantly maintaining temperature of hot water
EP2313694B1 (en) 2008-06-27 2016-04-27 Kyungdong One Corporation Method for controlling a hot water temperature in using low flux in hot water supply system
US8939196B2 (en) * 2009-02-13 2015-01-27 Toshiba Carrier Corporation Secondary pump type heat source and secondary pump type heat source control method
US8275483B2 (en) 2009-07-23 2012-09-25 Siemens Industry, Inc. Demand flow pumping
CN201589376U (en) 2009-12-31 2010-09-22 肖安 Central air-conditioning variable water volume and variable air volume whole group-control energy saving system
US9003821B2 (en) 2010-02-02 2015-04-14 Exaflop Llc Blended water-based data center cooling
CN201589718U (en) 2010-03-02 2010-09-22 中国船舶重工集团公司第七�三研究所 Energy saving cooling unit testing system
US9519297B1 (en) 2010-08-17 2016-12-13 Vytautas K. Virskus Dynamic differential energy control of hydronic heating or cooling systems
CN102288421A (en) 2011-05-03 2011-12-21 合肥通用机械研究院 Variable capacity chiller test device
US9810438B2 (en) 2011-08-26 2017-11-07 Optimum Energy Llc Controlled hydronic distribution system
US20140223941A1 (en) * 2011-09-30 2014-08-14 Daikin Industries, Ltd. Refrigeration system
US9845983B2 (en) 2012-04-06 2017-12-19 Zhongxi Tan Central air-conditioning system and control method thereof
CN103383121A (en) 2012-05-03 2013-11-06 南京市建筑设计研究院有限责任公司 District air-conditioner distributed secondary pump system
US9410752B2 (en) 2012-08-17 2016-08-09 Albert Reid Wallace Hydronic building systems control
EP2775221B1 (en) 2013-03-08 2018-09-05 Pompes Salmson Regulation of the flow and temperature of a sanitary hot water circulator
US10215427B2 (en) * 2013-04-01 2019-02-26 Carrier Corporation Air conditioning system and method for controlling air conditioning system
US10101730B2 (en) 2014-05-01 2018-10-16 Johnson Controls Technology Company Incorporating a load change penalty in central plant optimization
US20170234559A1 (en) 2014-08-14 2017-08-17 Vigilent Corporation Method and apparatus for optimizing control variables to minimize power consumption of cooling systems
US20170212488A1 (en) 2016-01-22 2017-07-27 Johnson Controls Technology Company Systems and methods for monitoring and controlling a central plant
CN105864016A (en) 2016-04-27 2016-08-17 西安建筑科技大学 Variable-water-volume operation regulating method for open multi-water-pump transmission and distribution system
WO2018011761A1 (en) 2016-07-15 2018-01-18 Barghest Building Performance Pte. Ltd. Method for improving operational efficiency of a cooling system through retrofitting a building with a master controller
WO2018087810A1 (en) 2016-11-08 2018-05-17 三菱電機株式会社 Heating control system and heat pump hot-water heating system
US20180239371A1 (en) 2017-02-22 2018-08-23 Johnson Controls Technology Company Integrated smart actuator device
US20180284701A1 (en) 2017-03-31 2018-10-04 Johnson Controls Technology Company Control system with dimension reduction for multivariable optimization

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Chilled-Water Systems Design Issues—Learning from Past Mistakes"; TRANE; Engineers Newsletter; vol. 43-2; 2014; 6 pages.

Also Published As

Publication number Publication date
US20200318849A1 (en) 2020-10-08
CN111795481B (en) 2023-05-23
CN111795481A (en) 2020-10-20

Similar Documents

Publication Publication Date Title
US11543148B2 (en) Air conditioning system and control method therof
US9562701B2 (en) Temperature control system and air conditioning system
CN109631376B (en) Screw type water chilling unit and control method and system thereof
EP2981767B1 (en) Air conditioning system and method for controlling an air conditioning system
JP5984456B2 (en) Heat source system control device, heat source system control method, heat source system, power adjustment network system, and heat source machine control device
JP2007315695A (en) Cold and hot water control method for cold and heat source machine, and air conditioning system using it
WO2021063088A1 (en) Cooling system and method for inverter, and air conditioning apparatus
CN109341131A (en) Air conditioner and temperature control method of electric controller of air conditioner
EP2737263B1 (en) Hvac systems
CN102052733A (en) Methods for efficient operation of cooling systems
JP6221198B2 (en) External control device
CN111059738A (en) Heat recovery side control system of heat recovery centrifugal unit
CN111023414B (en) Air conditioning system and dehumidification control method
US11384972B2 (en) Free cooling system
CN119737682A (en) Water source multi-connection control method, device, water source multi-connection and storage medium
JP2012013280A (en) Water heat source heat pump unit piping system
JP5677198B2 (en) Air cooling heat pump chiller
JP2011226680A (en) Cooling water producing facility
JP6024726B2 (en) External control device
CN112178873A (en) Adjusting and controlling method of water chilling unit and water chilling unit
JP6213781B2 (en) External controller control method
CN111121152B (en) Multi-connected outdoor unit and fresh air fan mixed connection system and control method thereof
CN109539432B (en) Air conditioner cooling water circulation system and air conditioner cooling water loop control method
CN110469925B (en) HVAC system and control method thereof
CN113899037B (en) Heat recovery system and control method thereof

Legal Events

Date Code Title Description
FEPP Fee payment procedure

Free format text: ENTITY STATUS SET TO UNDISCOUNTED (ORIGINAL EVENT CODE: BIG.); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

AS Assignment

Owner name: UNITED TECHNOLOGIES RESEARCH CENTRE IRELAND, LIMITED, CHINA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WANG, XIAOHONG;ZHAI, HUI;NI, JIAN;AND OTHERS;SIGNING DATES FROM 20190905 TO 20190928;REEL/FRAME:052339/0132

STPP Information on status: patent application and granting procedure in general

Free format text: APPLICATION DISPATCHED FROM PREEXAM, NOT YET DOCKETED

STPP Information on status: patent application and granting procedure in general

Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER

STPP Information on status: patent application and granting procedure in general

Free format text: NOTICE OF ALLOWANCE MAILED -- APPLICATION RECEIVED IN OFFICE OF PUBLICATIONS

AS Assignment

Owner name: CARRIER CORPORATION, FLORIDA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:RAYTHEON TECHNOLOGIES CORPORATION;REEL/FRAME:061910/0433

Effective date: 20210321

Owner name: RAYTHEON TECHNOLOGIES CORPORATION, MASSACHUSETTS

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:UNITED TECHNOLOGIES RESEARCH CENTER (CHINA) LTD.;REEL/FRAME:061910/0397

Effective date: 20211213

STPP Information on status: patent application and granting procedure in general

Free format text: PUBLICATIONS -- ISSUE FEE PAYMENT VERIFIED

STCF Information on status: patent grant

Free format text: PATENTED CASE